OneNote 1.3 is a free download, but caps the user's notes at 500, a number that includes both existing or newly-created notes. To exceed that limit, U.S. users must pay $4.99 for unlimited use on an iPhone, or $14.99 for an unlimited number of notes on an iPad.

Prices for users in other countries are posted on their versions of Apple's App Store.

OneNote 2010 -- the newest version for Windows -- retails for $79.99 as a standalone program, and is also included with Office Home and Student 2010, Office Home and Business 2010, and Office Professional 2010.

As ZDNet blogger Mary Jo Foley first reported today, Microsoft also plans on releasing iPhone and iPad versions of a Lync 2010 client.

"Lync 2010 for iPhone, iPad, Android phones and Nokia Symbian ... have been submitted to their respective mobile app stores and will be available very shortly," said Pat Fox, the senior director of marketing for Office, in a separate blog today.

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